Dental flask and charger



D. A. AKIN.

DENTAL FLASK AND CHARGER. APPLICATloN FILED FEB.'19. 1920.

Patented Sept. 28, 1920.

wvcntoz DelbeftAAlri n UNITED 'STATES DELBERT A AKIN,

PATENT omer..

or sPoxANE, WASHINGTON, AssieNoi?v or ONE-THIRD 'ro JOHN MECKAY AND ONE-THIRD TO EARL F. FULLER, BQTH OF SPOKANE WASHINGTON.

DENTAL rLAsK- AND CHARGER.

Aaplication ied February 19,- 1920.

To all. '1v/z om t may Conce/r11 Be it known that I, DELBERT A. AKIN, a citizen of the United States, residing at Spokane, in Spokane county and State of Washington, have invented certain new and useful Improvements in Dental. Flasks "and Chargers, of which the following is a -speciiication.

My present invention relates to animproved1dental flask and charger for forcing plastic material, -as rubber,.into the matrix of the dental mold or flask for-vulcanization of the dental plate and the teeth damped in the matrix between the mold,

members of the flask. According to my inventionv the flask for vulcanizing the dental plate is first inclosed within the steam vulcanizer, and after the proper or required steam pressure is supplied to the interior of the vulcanizer, the plastic composition is forced by: the charging device into the matrix of the inclosed flask at a lower pressure than that of the steam pressure in the vulcanizer.

The steam pressure is of course-excluded from the matrix or interior of the mold, and thus while adequate pressure is provided by `the charger for supplying the 'exact quantity of plastic material' to the matrix,

yet the pressure of steam, and the temperature of heat in the vulcanizer necessary for vulcanization, prevents disturbance of the mold and thus avoids danger of the production of distorted or irregular plates,due to the dislocation of the mold members, or the teeth within ythe matrix.

By the utilization of my method and the physical embodiment of my invention, I am enabled to supply the exact quantity of plastic material to the matrix to fill it in such manner as to produce a perfect and smoothly finished casting, which, without further treatment and accompanying loss of time and labor, is ready for application and use.

In the accompanying drawings I have illustrated one complete example of my invention in actual practice, wherein the parts are combined and arranged according to the best mode I have so far devised for the practical application of'the invention, and it will be understood that colorable changes and alterations may be made -in the structure as depicted, within the scope'of my Specification of Letters Patent.

led nut 10, when Patented Sept. 28, 1920. seran No. 359,913. y

claims without d myA invention.

Figure l is a view in vertical section through a well known type of dental vulcanizer and flask therein, with which is comb1ne d the .novel features and elements of my invention. v f

Fig. 2 is a transverse'view throu parting from the spirit of gh the `vulcanizer showingl the lower port1on of the matrix, and the charging pipe connected thereto..

In the picted the well known steam vulcanizer l..

used in the'm'echanical branch of the dental art, which is supplied with steam heat lfor vulcanization or hardeningof the plastic composition, as rubber, through the steam inlet pipe 2 in the top of the cylindrical casing or vulcanizer, and within the vulcanizer are shown two flasks as 3 and 3 of the variety used in dental casting. The usual pair of mold members 4 and 4 are clamped within the flask, forming between them the matrix or cavity 5 for the reception of the plastic rubber when casting the dental plate.

For converting the vulcanizer to be used in accordance with my invention I fashion vthe metallic casing or vcylinder with a pair and the other nearer the center thereof, ad-` jacent to the location of the flasks 3 and 3. The bosses are 4each provided with a stuifing box as 7 and 7 steamlfrom the vulcanizer, and a pair of charging pipes 8 and 8 are illustrated as entering the bosses,- the pipe 8 being equipped with a threaded socket member 9, and the pipe 8 not`in use, as indicated.

The plastic composition .or rubber to' be vulcanized is introduced through the charge pipe Siby the action of a charging gunof well known type embodying the cylindrical reservoir or barrel 11, the'reduced threaded head 12adapted to engage the socket 9, the piston head 13, screw-stem or plunger 14 and turning handle l5 on the threaded plunger or plunger bar.

In actual practice, the flasks are placed within the vulcanizer, after the matrix has been prepared, and the artificial teeth to be vulcanizedto the plate have been placed in preferredl form of the inventionto prevent escape of f being closed by the threadproper situation, and the charge pipe'Sis threaded into the orifice 8", prepared therefor in the flask, `in such manner that the charge pipe communicates with the interior of the matrix or cavity between the ytwo mold members 4 and 4.

The gun or charging device is then' threaded `with its head`12 1n the socket 9l of the chargeA pipe, ready for use. Before the charge is liowed'into-the matrix however, the steam for Vulcanization is admitted to the vulcanizer by turninga suitable controlling valve, and the steam pressure fills theninterior of the vulcanizingcylinder, the pressure being equalized all around the flask 3 and the members thereof are thus preventedl from being disturbed. The charging device is nowoperated by turning the handle 15 to gradually force the plastic materialfrom the reservoir through the charging pipe and into .the matrix and the -material flows evenly and uniformly into the matrix, filling every space therein with the exact quantity of material, required. l The ksuperior pressure of the steam in the vulcanizer over that exerted by the charging device holds the members of the mold against movement by vthe lesser pressure of the iowing plastic material, and thus any dislocation of parts is eliminated, with the result that a finished castingis provided, requiring no further treatment, and ready for use.

When one or the other of the charging pipes. 8 or 8 is not in use, the nut or cap 10 is threaded over the exterior threads of the socket member 9, and as will be seenin v plate is insured, and the charging-of the matrix after the fiask has been inclosed in Lesage-1'2- the vulcanizer and the steam pressure supplied obviates many objectionable features present in the practice of {iowing the material into the iiask before the latter is placed in the vulcanizer. In actual practice skill lis required andexperience is necessary in the performance of charging the matrix with the exact quantity of plastic material to thoroughly fill thematrix without an excess or'over'supply of material, but by the y utilization of this combination of elements',

those skilledin the-art are enabled to pros duce perfect dental plates, with 'despatch and aconsiderable saving in time and labor,

and the plates are ready for tting and use. WhatIclaim is l 1. The vcombination with the vulcanizer adapted to receive steam pressure as a heating medium and the flask having a matrix there1n,.of a charging pipe, passed through the wall of thevulcanizer and entered into f said flask to open into the matrix, said pipe having a socket end, and a charging device havlng a head to en age said socket in op- 2. The combination with aidental vulcanerative position for owing plastic material .into the matrix.

izer adapted to receive steam under pres- Y sure as a heating medium, and a flask having a matrix therein,'of ay charging pipe passed through the vulcanizer wall and opening into said matrix, and means for forcing plastic material through said pipe at a pressure lower than the steam pressure in thev vulcanizer.

' 3. rtf-,method of vulcanizing dental plates which consists in inclosing a flask and matrix within a vulcanizer, introducing steam f to the vulcanizer at a relatively 'high pressure and flowing plastic material to the matrix exclusive of the vulcanizer at a lower pressure' than the ysteam pressure within the vulcanizer.

In testimony whereof I affix my signature.

DELBERT A. AKIN. 

